Yariel Valdés González has asked for asylum in U.S.
Letters with hundreds of signatories urge Pompeo to disband panel
Former Air Force captain lost by 926 votes in 2018
Ricardo Rosselló under pressure to step down over offensive messages
Constitutional Court last month ruled in favor of issue
50 House Democrats sent letter to Mike Pompeo on Thursday
Leche Merchant arrived in Ciudad Juárez on Tuesday
Private company runs Cibola County Correctional Center
Ricardo Rosselló among officials in group chat made public
Cuba among countries that voted for resolution